function throttle (fn,delay){
    var t=null,
        begin=new Date().getTime();
    return function(){
        var _self=this,
            args=arguments,
            cur=new Date().getTime();
        clearTimeout(t);

        if(cur-begin>=delay){
            fn.apply(_self,args);
            begin=cur;
        }else{
            t=setTimeout(function(){
                fn.apply(_self,args);
            },delay);
        }
    }
}

export{
    throttle
}